A309422 Numbers k such that 7^k + k^7 is prime.

54, 3076, 11796

Offset

1,1

Comments

a(4) > 110000.

Links

Table of n, a(n) for n=1..3.

Crossrefs

Cf. A001596, A114974, A309421.

Sequence in context: A042405 A187304 A380243 * A212705 A046199 A245831

Adjacent sequences: A309419 A309420 A309421 * A309423 A309424 A309425

Keyword

nonn,bref,more,hard

Author

Hugo Pfoertner, Jul 30 2019

Status

approved